Tomorrow is Ours(1976)

Original title: 우리에게 내일은 있다

Han Jeong-ah, born to a poor family, completed middle school with the help of Mrs. Yuk Young-soo, but finding it difficult to advance to high school, she takes a job at a textile factory in Masan. That company is planning to establish a vocational high school. However, as orders increased, they find themselves in a position where they have to convert the school under construction into a farm.